Physics
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976phdt.........6w&link_type=abstract
Ph.D. Thesis Rice Univ., Houston, TX.
Physics
1
Galactic Nuclei, Galactic Radiation, Gamma Rays, Balloon-Borne Instruments, Interstellar Matter, Line Spectra
Scientific paper
A balloon-borne gamma ray telescope observed the galactic center region in the 0.02 MeV - 12.27 MeV energy interval. The gamma ray spectrum was found to be characterized by a power law continuum with superimposed spectral features that were identified as gamma ray nuclear lines. Probable sources for these lines are the relatively abundant nuclides Ne-20, Mg-24, and Si-28. At 4.6 + or - 0.1 MeV a spectral feature consistent with a 10% broadened line was detected. The 4.43 MeV line of C-12 was taken to be the most probable source. The results of the present experiment thus constitute the first detection of extra-solar system gamma ray nuclear lines. The general mechanism responsible for the production of the gamma ray nuclear lines was taken to be the interaction of low energy cosmic rays with the interstellar medium. From an analysis of the relative intensities of the various lines, an estimate for the power law index of the low energy cosmic ray spectrum in the galactic center region was obtained.
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